R. Pickhardt, T. Gottron, A. Scherp, S. Staab, und J. Kunze. 2012 International Conference on Privacy, Security, Risk and Trust, PASSAT 2012, and 2012 International Confernece on Social Computing, SocialCom 2012, Amsterdam, Netherlands, September 3-5, 2012, Seite 123--133. (2012)